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Experimental Research on Formation of Algae Bloom in Yanghe Reservoir

HUAJinbiao ZONGZhixiang(Department of Biology,Peking University,Beijing,100871)  
The research was conducted in a controlled experimented Ecosystem in Yanghe Reservoir.Combined with direct monitoring on the studied water-body,this research observes the whole procedure from the rapid growth of algae population through the disappearance of algae bloom. Controlling factors contributing to the formation of algae bloom are also included in the study.The result shows that eu-trophication is the major reason responsible for the bloom formation and the abnor-mal growth of algae population composes the premise of this procedure.The thresh-old of bloom formation on the surface of reservoir is 48.0ug/l.A condition with 26℃ temperature and 23000 lux light intensity is proved to be optimum for up一floating and assemblage of algae population. Breeze with velocity of less than 2m/scan accelerate the assemblage procedure. It is estimated that the index of vertical as-semblage and horizontal drifting assemblage are 1.23 and 15.7 respectively.Theoverall assemblage index is 19.3.Experiment shows that the concentration capacities of N and P determine thepeak value of algae growth.A significant relationship between concentration of Pand growth rate of algae is identified.In Yanghe Reservoir,the summer growth rateof Microcystis aeruginosa can reach 10.42 μg. Chla/l.d while the semi一saturationconstant for P absorption is 0.078×10 ̄(-6).
【CateGory Index】: X171
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